\Ab*scis"sion\, n. [L. abscissio. See {Abscind}.]
1. The act or process of cutting off. ``Not to be cured
without the abscission of a member.'' --Jer. Taylor.
2. The state of being cut off. --Sir T. Browne.
3. (Rhet.) A figure of speech employed when a speaker having
begun to say a thing stops abruptly: thus, ``He is a man
of so much honor and candor, and of such generosity -- but
I need say no more.''

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Biology Dictionary

Definition:

The normal shedding from a plant of an organ that is mature or aged, e.g. a ripe fruit, an old leaf. adj. abscissile.